text: /*
   *	Network event notifiers
   *
   *	Authors:
   *      Tom Tucker             <tom@opengridcomputing.com>
   *      Steve Wise             <swise@opengridcomputing.com>
   *
   *	This program is free software; you can redistribute it and/or
   *      modify it under the terms of the GNU General Public License
   *      as published by the Free Software Foundation; either version
   *      2 of the License, or (at your option) any later version.
   *
   *	Fixes:
   */
  
  #include <linux/rtnetlink.h>
  #include <linux/notifier.h>
  
  static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain);
  
  /**
   *	register_netevent_notifier - register a netevent notifier block
   *	@nb: notifier
   *
   *	Register a notifier to be called when a netevent occurs.
   *	The notifier passed is linked into the kernel structures and must
   *	not be reused until it has been unregistered. A negative errno code
   *	is returned on a failure.
   */
  int register_netevent_notifier(struct notifier_block *nb)
  {
  	int err;
  
  	err = atomic_notifier_chain_register(&netevent_notif_chain, nb);
  	return err;
  }
  
  /**
   *	netevent_unregister_notifier - unregister a netevent notifier block
   *	@nb: notifier
   *
   *	Unregister a notifier previously registered by
   *	register_neigh_notifier(). The notifier is unlinked into the
   *	kernel structures and may then be reused. A negative errno code
   *	is returned on a failure.
   */
  
  int unregister_netevent_notifier(struct notifier_block *nb)
  {
  	return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
  }
  
  /**
   *	call_netevent_notifiers - call all netevent notifier blocks
   *      @val: value passed unmodified to notifier function
   *      @v:   pointer passed unmodified to notifier function
   *
   *	Call all neighbour notifier blocks.  Parameters and return value
   *	are as for notifier_call_chain().
   */
  
  int call_netevent_notifiers(unsigned long val, void *v)
  {
  	return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
  }
  
  EXPORT_SYMBOL_GPL(register_netevent_notifier);
  EXPORT_SYMBOL_GPL(unregister_netevent_notifier);
  EXPORT_SYMBOL_GPL(call_netevent_notifiers);
  